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Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway

Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway

Item # RM-4139-300
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Attach these durable, flexible polyurethane bushings to the rear anti-sway bar of your vehicle and experience a better, more controlled ride. 1-800-940-8924 to order Roadmaster accessories and parts part number RM-4139-300 or order online at Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway. Accessories and Parts reviews from real customers.
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  • Reviews (48)
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Roadmaster Accessories and Parts - RM-4139-300

  • Anti-Sway Bars
  • Anti-Sway Bar Parts
  • Bushings
  • Roadmaster
  • 1-3/8 Inch Diameter
  • Rear Anti-Sway Bar

Attach these durable, flexible polyurethane bushings to the rear anti-sway bar of your vehicle and experience a better, more controlled ride.


  • Replacement bushings work with your factory, rear anti-sway bar to improve the overall stability of your vehicle
  • Flexible design keeps anti-sway system from being too rigid
  • Polyurethane is durable and resistant to damage caused by oil, gasoline and ozone
    • Less wear means less give in your anti-sway system and better support
  • 2 Bushings and necessary hardware included
  • Made in USA

Roadmaster Anti-Sway Polyurethane Bushings

Superior Construction

The lubricated bushings in your anti-sway system allow just enough pivot and rotation to compensate for the pressure placed on one side of your vehicle when it goes into sudden maneuvers, hits crosswinds or encounters shifting weights. These bushings, therefore, must be both durable and flexible. Polyurethane allows an appropriate amount of give and lasts longer than rubber, which is the standard material used in bushings, thus ensuring that the system is neither so rigid nor so malleable that it becomes ineffective.

4139-300 Roadmaster Bushing Kit for Rear Anti-Sway Bar

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway - RM-4139-300

Average Customer Rating:  4.9 out of 5 stars   (48 Customer Reviews)

Attach these durable, flexible polyurethane bushings to the rear anti-sway bar of your vehicle and experience a better, more controlled ride.


Perfect replacement clamps and hardware for factory installed rear sway bar. If your clamps are missing or the bushings are worn this is all you need. Fast shipment as well.

2008 Ford F-53

The item came exactly when it was scheduled. The installation was simple, thanks to the great How-To video produced by etrailer. I’m a huge fan of etrailer and have shopped them almost exclusively since buying my RV. I’ll be back I’m sure.


Whenever we purchase from you it is as expected and delivered on time. Really helped our motorhome with the anti sway added. Worth it for sure.


I thought you sent the wrong parts, but you sent other parts for different sway bar. So ignore the 1st. Email I sent with pictures. It 97° outside. I'll change them in morning. Thanks!


Easy replacement and seems superior to factory OEM.


Easy to install and did seem to improve handling.


Parts arrived earlier than expected. Included additional parts and hardware not required for my application. Install time was just shy of 20 minutes start to finish. Did the job... Back on the road. Thanks etrailer.


Made a world of difference


Great product..high quality replacement parts for motor home


Good online service


Works as advertised!


They fit perfectly, install was a breeze. If my front ones go, I'll be coming back to get them here.


Ordered sway bar bushings on Tuesday got them on Thursday put them in Friday and went on a weekend trip Saturday. Got what I needed, got it fast. Thanks etrailer!


The bushing kit was exactly as they advertised. The fit was perfect and installation was simple with the instructions provided.


The old ones that I took out were shot and installing these new ones fixed a lot of my wandering problems with my motor home....

2011 Ford F-53

Item arrived today.all good so far.great people who know what there doing.haven't had time to install it yet but will let ya know how that goes soon.


Always a good experience to shop at etr ailer


Easy fitment, great replacement over stock items


Ordered this kit to replace OEM bushings that failed.....


Easy to install and and exactly what I needed. Was shipped quickly and arrived in a few days.


Very easy to order and fast delivery


Getting our 2014 Winnebago in superior shape for the road. Too bad the Ford Chassis did not deliver with these easy upgrades.


Could only use the largest two as the others did not fit. Those two did a great job.

2006 Ford F-53

easy install, I just raised the vehicle at the frame that removed pressure at the bar added new parts done.


Fantastic customer service , package arrived on time ready to install tomorrow thanks so much .

Show More Reviews

See what our Experts say about this Roadmaster Accessories and Parts

  • Torque Specs for Roadmaster Bushing Kit # RM-4139-300
    I spoke with my contact at Roadmaster regarding any torque specs when installing the Bushing Kit # RM-4139-300 that you referenced. He said that for the bushings themselves there isn't a recommended torque spec because you really just want to tighten them enough so that the bushing is being squeezed a bit. Overtightening can cause damage so you want to be careful. For the saddle brackets it will depend on what size bolt you are using. For a 10mm bolt they recommend 37 foot pounds of torque...
    view full answer...
  • Does Roadmaster Polyurethane Bushing Kit RM-4139-300 Fit 2014 Ford F-53
    For a motorhome built on a 2014 Ford F-53 chassis the Roadmaster bushing kit part # RM-4139-300 that you referenced is a confirmed fit.
    view full answer...
  • Distance Between Bushing Bracket Mounting Holes Roadmaster Bushing Kit # RM-4139-300
    The distance on center between the bracket mounting holes of the Roadmaster Polyurethane Bushing Kit # RM-4139-300 that you referenced is 4-1/8 inches.
    view full answer...
  • Does Roadmaster Bushing Kit # RM-1139-300 Fit 2019 Ford F-53
    Yes, since your 2019 Ford F-53 motorhome has a sway bar with a 1-3/8 inch diameter the bushing kit part # RM-4139-300 would fit.
    view full answer...
  • Replacement Poly Bushings for Rear Anti-Sway Bar on a 2011 Tiffin Allegro on a Ford F-550 Chassis
    Rear poly bushing kit # RM-4139-125 is indeed a fit for your 2011 Tiffin Allegro built on a Ford F-550 chassis. Roadmaster notes that some of the endlink parts may not be used in the installation and that the fit assumes a 1-1/2 inch OEM bar. Your bar at 1-27/64 inches (1.42 inches) is very close but ultimately too small for a proper fit and you will need a different option. The other option is # RM-4139-300 for a 1-3/8 inch diameter bar. This is actually closer to the 1.42 inch bar...
    view full answer...
  • Replacement Bushing for Rear Sway Bar of 2007 Fleetwood Bounder 33R
    We do have replacement bushing and mount kits that fit your 2007 Fleetwood Bounder 33R for the rear sway bar but it depends on what the diameter of your factory bar is. If the diameter is 1-3/8 inch you'd want the part # RM-4139-300 or if it's 1-1/2 inch # RM-4139-125. Since there's no way for us to know which diameter bar you have now you'll have to run out and measure to determine what you'd need.
    view full answer...
  • Anti-Sway Bar Bushings For 2005 Ford F-550 Chassis Class A Motorhome
    We do have bushing kits for the OEM anti-sway bar on your Sea Breeze built on a 2005 Ford F-550 chassis, and the bushings include the brackets as well. There are different bushings depending on the diameter of your anti-sway bar, so you will need to measure it to ensure you get the right kit, and I'll list out the options for you: - Rear 1-1/2" Diameter Bar: Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar # RM-4139-125 - Rear 1-3/8" Diameter Bar: Roadmaster...
    view full answer...
  • Replacement Anti-Sway Bar Bushings for Motorhome On Ford F-53 Chassis
    In order to replace just the factory anti-sway bar bushings on a Ford F-53 Chassis you have a few options which will be based on the location of the anti-sway bar (front/rear) and the gross vehicle weight rating of the coach (15,700 lbs, 16,000 lbs etc.) or diameter of the factory sway bar (1-1/2", 1-3/8", or 1-5/8"). If you need bushings for a front anti-sway bar and it is 1-5/8" diameter then you can use the Roadmaster Polyurethane Bushing Kit part # RM-4139-127 but if you need bushings...
    view full answer...
  • 2014 Winnebago Vista35F 22k GVWR F53 Sway Bar Brackets and Bushings
    The stock rear bar of your 2014 Winnebago Vista built on a Ford 22k chassis has a 1-3/8inch diameter which we have a kit for all new brackets and bushings with the part # RM-4139-300.
    view full answer...
  • Which Sway Bar Bushing Replacement for Rear Bar of 2017 Thor Miramar 34.2
    For a motorhome built on a 2016 Ford F-53 chassis with a 26k GVWR the correct bushing kit for the rear sway bar is the part # RM88FR which has a 1-1/2 inch diameter.
    view full answer...
  • Suspension Enhancement for Itasca RV on 2014 Ford F-53 Chassis
    I recommend having your suspension checked out to make sure there are no issues, but if everything is fine, suspension enhancement springs would help level your Itasca. I could not guarantee this will "fix" your lean but the SumoSprings Maxim Custom Helper Springs # SSR-187-54-1 are designed to help keep your RV level and minimize sway. These springs are for 2-wheel drive models - as each of the available springs we offer are - with a GVWR between 20,000 and 26,000 lbs. As for the bushings,...
    view full answer...
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  • Replacement Bushings 2007 Four Winds Hurricane On 2006 Ford 53 Chassis
    Depending on the diameter of your existing bushings the Roadmaster Polyurethane Bushing Kit for 1 5/8 inch diameter # RM-4139-127 may fit. We also offer a few other sizes to choose from. Rear 1 1/2 inch Diameter Bar: Roadmaster Polyurethane Bushing Kit for 1 1/2 inch Diameter, Factory Rear Anti-Sway Bar # RM-4139-125 Rear 1 3/8 inch Diameter Bar: Roadmaster Polyurethane Bushing Kit for 1 3/8 Diameter, Factory Rear Anti-Sway Bar # RM-4139-300 We also have Replacement Split Bushing for...
    view full answer...
  • 2018 Forest River FR3 32DS Anti-Sway Bar Bushings and Replacement Sway Bars
    I would be happy to help you find those parts for your 2018 Forest River FR3 Motorhome. We have 3 different OEM bushing kits depending on which size sway bar your Motorhome came with. The first is the Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway item # RM-4139-300. This is for the 1 3/8" OEM rear anti-sway bar. The second is the Roadmaster Polyurethane Bushing Kit for 1-1/2" Diameter, Factory Rear Anti-Sway Bar item # RM88FR. This is for the 1 1/2"...
    view full answer...
  • Recommended Anti-Sway and Suspension Enhancement for 2020 Thor Minamar
    For your 2020 Thor Minamar, I recommend the Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway # RM-4139-300 which is a confirmed fit and the rear anti-sway has the most impact on the ride quality so this is the first element if you need to add parts in stages. This will help stabilize the rear end. For the front, I recommend the Roadmaster Polyurethane Bushing Kit for 1-5/8" Diameter, Factory Front Anti-Sway Bar # RM-4139-127. These combined will give you...
    view full answer...
  • Roadmaster Vehicle Sway Bar and Steering Stabilizer Recommendation for 2019 Winnebago Intent 31P
    Your 2019 Winnebago Intent 31P is built on a Ford F53 Chassis and based on the GVWR of 18,000 lbs I will make my recommendation for the correct front and rear anti-sway bar as well as the steering stabilizer below: # RM-1139-148 - Intended to replace an 1-3/4 inch diameter OEM front sway bar # RM-4139-125 - Intended to replace an 1-1/2 OEM rear sway bar OR # RM-4139-300 - Intended to replace an 1-3/8 OEM rear sway bar Note that some of the endlink parts may not be used when installing...
    view full answer...
  • What is the Difference Between the Different Color SumoSprings for the 2019 Coachman Mirada 32SS.
    You are correct that the different colors on the SumoSprings Custom Helper Springs like the # SSR-187-54-1 note the different densities of the springs; the yellow springs that you were looking at and are mentioned above are the stiffest compression strength springs available for your 2020 Coachman Mirada 32SS and are the best choice to help reduce the side-to-side sway you're experiencing. For reference, the blue SumoSprings are for light duty applications, the black are designed for...
    view full answer...
  • Sway Bars and Steering Stabilizer Recommendation for 2015 Fleetwood Storm
    The biggest improvement you'll make the stability, handling and ride quality of your 2015 Fleetwood Storm with an 18,000 GVWR is with a rear sway bar part # RM-1139-146 which works with the stock sway bar to make a drastic improvement. For a bushing kit for your factory bar you'd want the part # RM-4139-300. Next biggest improvement you'll make is with a new front sway bar part # RM-1139-148 which replaces the factory front sway bar. Following that I would highly recommend a steering...
    view full answer...
  • Recommended Replacement Bushings For A Roadmaster RM-4139-300 Kit
    I will start off by saying that the Replacement Bushing # RM-205381-00 is the direct replacement for the Roadmaster Polyurethane Bushing Kit for 1-3/8" Diameter, Factory Rear Anti-Sway # RM-4139-300. To further that, the Replacement Polyurethane Hat Bushing # RM-205223-00 and Replacement Bushing # RM-205219-10 will also be direct replacements for this kit. As to the measurements, the # RM-205393-00 will measure .62" thick and have a 1.28" outer diameter and .43" inner diameter. The # RM-205381-00...
    view full answer...
    Image 1 for
  • Recommended Rear Sway Bar For A 2005 Monaco Monarch On A Ford F53 Chassis
    Though we cannot see your cart, I can definitely tell you that if you are getting a lot of issues with sway and or body roll, I recommend going with the Roadmaster Rear Anti-Sway Bar # 1139-144. This is 1-3/4" thick 4140 chromoly steel for superior strength that will do a much better job than stock bars. With that said, this actually will not replace the original sway bar and you will keep that installed. So if your older bushings are looking a bit worse for wear, I do recommend getting...
    view full answer...
  • Correct SumoSprings for 2020 Mirada on Ford F-53 Chassis
    The correct SumoSprings that fit your 2020 Coachmen Mirada depends on what the GVWR is for your RV, but don't worry because we have a fit for all 2019 Ford F-53 options so you just need to choose from the list below (and/or let me know what model Mirada you have): Front Axle 16K - 22K - # SSF-170-40-2 24K - 26K - # SSF-173-40-2 Rear Axle 16K - 18K - # SSR-184-40-1 20K - 22K - # SSR-180-54-1 24K - 26K - # SSR-183-54-1 Other upgrades you can add to your Class A RV are front and rear sway...
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Andrew S
Test Fit:
Andrew S
Employee David F
Test Fit:
David F

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